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THOMAS H. BUR-RIDGE, OF ST, LOUIS, MISSOURI, ASSIGNOR TO HIMSELITv AND G. C. FABIAN, OF SAME PLACE.

Letters Patent No. 66,673, dated July/.16, 1867.

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'lO ALL WHOM IT MAY GONCERN:

Beit known that I, THOMAS H. BUBRIDGE, of the city and County of St. Louis, and State of Missouri, have invented a new and useful ,Improvcmentin Window-Sash; and I do hereby declare that the following is a. full and clear description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Figure-1 of the drawings isa sectional elevation of a. window fitted with the improved sash and blind.

Figures 2 and Sere' horizontal sections of a window-frame fitted with'the improved sash and blind.

` The nature of this invention consists in applying to the edge of the sash a strip of wood, the length and width of which are equal to the length and thickness of the sash or blind, the said strip being let into a groove ploughed in tbe edge of the sash or blind-stile, and thrown out aga-inst the window-frame by means of springs, in

such a. manner that the entire surface of the face of said strip will .press with uniform force against the pulley.

st'ile of the Window-frame in su'ch a manner as to produce a suiiicient aniount of friction to .hold the sash up ati any point which may be desired.

To enable those skilled in the art to make and use my. improved isash and blind, I will proceed to describe their construction and operation.

A represents the stile of the window-frame, and a the stops and parting strips which hold the sash Band biind C in place, and forni the grooves for tbeni to run in. A groove ploughed into the edge of the sash or blindstile, as shown in figs. 2 and 3, permits the tongue of the strip D to enter therein. The strip D should be of the same length as the stile of the sash, and the width of it the saine as the thiol-:ness of' the sash. There are to be two or more springs d, of India rubber, (or some equivalent kind ol springs,.) interposed between the stileI of the 'sash and the strip D, so as to press the said strip out against the stile A with equal force throughout the whole of its length. The special arrangement of these net-ing parts is as shown in the drawing, Vmarked detaih where the strip D has the trapezoidal side projections or tongnrs c? entering a proper groove of the sash B or' blind C, the rubber d', by 'pressing against B (or 0,) and acting on d, pressing the same, and with it the strip D, aga-inst the stile A. In lifting the sash or blind the tendency is to compress the spring d', thus the strip D may more towards 13(01 0,) and the friction be decreased in proportion with the decrease of the pressure ot' the spring d".' In any case the series of springs d act together and with equal force, as before stated. 'A uniform friction will thus beprodueed between the strip D and the stileA, whitzh will besuliieient to hold the sash up atl any required position,l the same as cords and weights do, but at mneh less expense of construction. The strip D may be applied to both the upper and lower sashes et' the saine window, sothat the window may lie-opened either at the top or bottom, a's in the most approved manner of construction. The strip D may be confined in its 4vertical position (relatively to the sash or blind) by means ofthe projecting ends of the rails of the sash or blind, or by the pin c driven into the stile thereof. Either of these arrangements is to be so made as to allow free lateral motion to the strip D.

I do not claim a tongued strip D, arranged with a sash or blind grooved to receive said strip; nor do I claim the arrangement of springs with a friction strip; 'but what I do claim isr Y The combination of'a tropezoidal tongue or series ot' tongues d with the spring d and the strip D, the sash or blind and the Window-stile, when acting substantially as and for the purpose set forth.

'THOMAS H. BURRIDGE.

Witnesses:

M. RANDOLPH, CEAS. H. BoYLE. 

